微波辅助过一硫酸盐降解工业场地污染土壤中的多环芳烃

Microwave Assisted Degradation of Polycyclic Aromatic Hydrocarbons(PAHs)in Contaminated Soil at an Industrial Site by Peroxymonosulphate(PMS)

将微波(MV)加热与高级氧化技术相结合,采用微波辅助Fe^(2+)活化过一硫酸盐(PMS)体系降解实际工业场地污染土壤中的16种多环芳烃(PAHs)。比较了微波和PMS作用下4种降解体系对4种PAHs的降解效果,分别考察了微波和PMS耦合体系中PMS浓度、Fe^(2+)浓度以及微波辐照功率对PAHs降解效果的影响,并对该体系的降解机制进行分析。结果表明,分别投加5 mL的5 mM Fe^(2+)、200 mM PMS在700 W微波辐照8 min条件下,微波与PMS具有显著的协同效应,土壤中PAHs的降解率最高达94.91%;苯并(a)芘(BaP)、菲(PHE)、荧蒽(FLT)和芘(PYR)的降解率分别为94.91%、61.54%、64.90%和66.98%。研究可为微波辅助Fe^(2+)活化PMS体系降解实际工业场地污染土壤中的PAHs提供实践指导和技术参考。

Combining microwave heating with advanced oxidation technology,a system of Fe(Ⅱ)activating peroxymonosulphate(PMS)assisted by microwave was employed to degrade 16 species of polycyclic aromatic hydrocarbons(PAHs)in contaminated soil at an actual industrial site.The degradation effects of four different systems with microwave and PMS on four species of PAHs were compared.The influences of PMS content,Fe(Ⅱ)concentration and microwave irradiation power in the microwave/PMS coupling system on the degradation of PAHs were individually investigated,whilst conducting an analysis on the degradation mechanism of the system.It has shown that a remarkable synergistic effect was observed between microwave and PMS when adding 5 mL of 5 mmol Fe(Ⅱ)and 5 mL of 200 mmol PMS under 700 watt microwave irradiation for 8 minutes.The degradation rates of PAHs in soil could top out at 94.91%,in which those of benzo[a]pyrene(BaP),phenanthrene(PHE),fluoranthene(FLT)and pyrene(PYR)could reach 94.91%,61.54%,64.90%and 66.98%,respectively.It may provide practical guidance and technical reference for the degradation of PAHs in contaminated soil at actual industrial sites by such a system.